using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using InABox.Clients;
using InABox.Core;
using Comal.Classes;
using Xamarin.Forms;
using System.Linq;
using System.Threading.Tasks;
using comal.timesheets.CustomControls;
using comal.timesheets.iOS.Assignments;
using InABox.Configuration;
using Syncfusion.Office;
using Syncfusion.SfSchedule.XForms;
using Xamarin.Forms.Xaml;
using XF.Material.Forms;
using XF.Material.Forms.UI.Dialogs;
using XF.Material.Forms.UI.Dialogs.Configurations;

namespace comal.timesheets
{

    public enum AssignmentView
    {
        Day,
        TimeLine
    }
    
    public partial class AssignmentList : ContentPage
    {

        private AssignmentEdit _editor = null;

        private Guid[] _employeeids = new Guid[] { };
        
        private AssignmentModuleSettings _settings = null;

        private AssignmentView _view = AssignmentView.Day;

        public AssignmentList()
        {
            InitializeComponent();
            _settings = new LocalConfiguration<AssignmentModuleSettings>().Load();

            DatePicker.Date = _settings.Date.IsEmpty() ? DateTime.Today : _settings.Date;
            
            _view = _settings.View;
            
            _employeeids = (_settings.Employees != null)
                ? _settings.Employees
                : new Guid[] { App.Data.Employee.ID };
            
        }
        
        
        protected override void OnAppearing()
        {
            base.OnAppearing();
            Reload();
        }
        
        private void Reload()
        {

            DayView.DataSource = null;         
            TimeLineView.DataSource = null;    
            
            if (_view == AssignmentView.Day)
            {
                DayViewColumn.Width = new GridLength(1, GridUnitType.Star);
                TimeLineViewColumn.Width = new GridLength(0, GridUnitType.Absolute);
                DayView.DayViewSettings.DayLabelSettings.TimeFormat = "HH:mm";
            }
            else
            {
                DayViewColumn.Width = new GridLength(0, GridUnitType.Absolute);
                TimeLineViewColumn.Width = new GridLength(1, GridUnitType.Star);

                TimeLineView.ResourceViewSettings.VisibleResourceCount = Math.Max(1,Math.Min(8, _employeeids.Length));
                TimeLineView.TimelineViewSettings.AppointmentHeight =
                    (this.Height / TimeLineView.ResourceViewSettings.VisibleResourceCount) + 100;
                
                var resources = new ObservableCollection<object>();
                foreach (var empid in _employeeids)
                {
                    var empname = GlobalVariables.EmployeeShells.FirstOrDefault(x => x.ID == empid)?.Name ?? empid.ToString();
                    resources.Add(
                        new ScheduleResource()
                        {
                            Name =  empname, //String.Join("", empname.Split(' ').Select(x=>x.Substring(0,1))),
                            Id = empid,
                            Color = Color.Red,
                            Image = ""
                        }
                    );
                }
                TimeLineView.ScheduleResources = resources;
                TimeLineView.ShowResourceView = true;

            }
            


            Refresh();
        }
        
        private void Refresh()
        {
            Title.Text = $"{DatePicker.Date:dd MMMM yyyy}";
            DataModel.Load(
                new Filter<Assignment>(x => x.Date).IsEqualTo(DatePicker.Date).And(x => x.EmployeeLink.ID).InList(_employeeids),
                () =>
                {
                    Dispatcher.BeginInvokeOnMainThread(() =>{
                        if (_view == AssignmentView.Day)
                            DayView.DataSource = new ObservableCollection<AssignmentListDataModelItem>(DataModel.Items);
                        else
                            TimeLineView.DataSource = new ObservableCollection<AssignmentListDataModelItem>(DataModel.Items);
                    });

                }
            );

       }
        
        private void BackButton_OnClicked(object sender, EventArgs e)
        {
            Navigation.PopAsync();
        }
        
        private void SelectedDate_Tapped(object sender, EventArgs e)
        {
            DatePicker.Focus();
        }

        private void DatePicker_OnDateSelected(object sender, DateChangedEventArgs e)
        {
            if (_employeeids.Any())
            {
                _settings.Date = DatePicker.Date;
                new LocalConfiguration<AssignmentModuleSettings>().Save(_settings);
            }
            DayView.MoveToDate = DatePicker.Date;
            TimeLineView.MoveToDate = DatePicker.Date;
            Dispatcher.BeginInvokeOnMainThread(()=>
            {
                Refresh();
            });
        }

        private async void SelectEmployees_Tapped(object sender, EventArgs e)
        {

            var actions = new List<string>() { "Only Me" };
            actions.AddRange(GlobalVariables.TeamEmployeeShells.Where(x=>x.ID == App.Data.Employee.ID).Select(x=>x.TeamName).Distinct());
            
            var result = await MaterialDialog.Instance.SelectActionAsync(title: "Select a Team", 
                actions: actions);

            if (result == 0)
            {
                _view = AssignmentView.Day;
                _employeeids = new Guid[] { App.Data.Employee.ID };
            }
            else if (result > 0)
            {
                _view = AssignmentView.TimeLine;
                _employeeids = GlobalVariables.TeamEmployeeShells.Where(x => String.Equals(x.TeamName, actions[result]))
                    .Select(x => x.ID).Distinct().ToArray();
            }

            _settings.Employees = _employeeids;
            _settings.View = _view;
            new LocalConfiguration<AssignmentModuleSettings>().Save(_settings);
            
            Dispatcher.BeginInvokeOnMainThread(()=>
            {
                Reload();
            });
        }
        
        private async void Schedule_OnCellTapped(object sender, CellTappedEventArgs e)
        {
            if (e.Appointment is AssignmentListDataModelItem item)
            {
                var editor = new AssignmentEdit(item);
                Navigation.PushAsync(editor);
            }
        }
        
        private async void Schedule_OnCellLongPressed(object sender, CellTappedEventArgs e)
        {
            if (e.Appointment == null)
            {
                if (InABox.Core.Security.CanEdit<Assignment>())
                {
                    var assignment = new Assignment()
                    {
                        Date = e.Datetime.Date,
                        Start = new TimeSpan(e.Datetime.TimeOfDay.Hours,0,0),
                        Finish = e.Datetime.TimeOfDay.Add(new TimeSpan(1, 0, 0)),
                        Duration = new TimeSpan(1, 0, 0),
                        Title = "New Assignment"
                    };
                    assignment.EmployeeLink.ID = (e.Resource is ScheduleResource sr)
                        ? (Guid)sr.Id
                        : App.Data.Employee.ID;
                    
                    var editor = new AssignmentEdit(assignment);
                    Navigation.PushAsync(editor);
                }
            }
            else if (InABox.Core.Security.CanDelete<Assignment>())
            {
                var confirm = await MaterialDialog.Instance.ConfirmAsync(
                    "Are you sure you wish to delete this assignment?",
                    "Confirm Deletion",
                    "Yes, Delete", 
                    "Cancel", 
                    new MaterialAlertDialogConfiguration()
                    {
                        ButtonFontFamily = Material.FontFamily.Body2
                    }
                );
                if (confirm == true)
                {
                    using(await MaterialDialog.Instance.LoadingDialogAsync(message: "Deleting Assignment"))
                    {
                        var assignment = new Assignment() { ID = (e.Appointment as AssignmentListDataModelItem).Id };
                        new Client<Assignment>().Delete(assignment, "Deleted on Mobile Device");
                    }
                    Refresh();
                }
            }
        }
        
    }
}